We have been using AT&T U-verse DSL. We have cancelled AT&T and added Xfinity Internet to our Xfinity cable TV. The Xfiinty modem/router is extremely weak, can't get internet in 3/4 of the house (never a problem with AT&T).
1. What is the best solution?
2. I have a Linksys 1900AC router. Can this be used to improve internet thoughout the house? If so, what are the steps?
Some tips for improving WiFi performance;
There are other options. Google for WiFi repeaters / range extenders, WiFi mesh systems / pods, powerline ethernet adapters, MoCA adapters. Good luck !